diff --git a/library/core/src/ops/async_function.rs b/library/core/src/ops/async_function.rs
index 2ee243ea85eb..a5812a762175 100644
--- a/library/core/src/ops/async_function.rs
+++ b/library/core/src/ops/async_function.rs
@@ -7,7 +7,6 @@ use crate::marker::Tuple;
 #[cfg_attr(bootstrap, unstable(feature = "async_closure", issue = "62290"))]
 #[cfg_attr(not(bootstrap), stable(feature = "async_closure", since = "1.85.0"))]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn"]
 pub trait AsyncFn<Args: Tuple>: AsyncFnMut<Args> {
@@ -22,7 +21,6 @@ pub trait AsyncFn<Args: Tuple>: AsyncFnMut<Args> {
 #[cfg_attr(bootstrap, unstable(feature = "async_closure", issue = "62290"))]
 #[cfg_attr(not(bootstrap), stable(feature = "async_closure", since = "1.85.0"))]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn_mut"]
 pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
@@ -44,7 +42,6 @@ pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
 #[cfg_attr(bootstrap, unstable(feature = "async_closure", issue = "62290"))]
 #[cfg_attr(not(bootstrap), stable(feature = "async_closure", since = "1.85.0"))]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn_once"]
 pub trait AsyncFnOnce<Args: Tuple> {